1 |
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#include <stdio.h> |
2 |
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#include <unistd.h> |
3 |
#include <string.h> |
#include <string.h> |
4 |
#include <errno.h> |
#include <errno.h> |
|
#include <unistd.h> |
|
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#include <sys/time.h> |
|
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#include <sys/types.h> |
|
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#include <sys/socket.h> |
|
5 |
#include <netinet/in.h> |
#include <netinet/in.h> |
6 |
#include <netdb.h> |
#include <netdb.h> |
7 |
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#include <sys/socket.h> |
8 |
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#include <sys/types.h> /* For POSIX.1-2001 non-conformant systems. */ |
9 |
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#include <sys/time.h> /* For POSIX.1-2001 non-conformant systems. */ |
10 |
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#include <sys/select.h> |
11 |
#include <fcntl.h> |
#include <fcntl.h> |
12 |
|
|
13 |
#include "config.h" |
#include "config.h" |
16 |
#ifdef SSL_TLS |
#ifdef SSL_TLS |
17 |
#include <openssl/ssl.h> |
#include <openssl/ssl.h> |
18 |
#include <openssl/err.h> |
#include <openssl/err.h> |
|
#include <openssl/x509.h> |
|
19 |
#endif |
#endif |
20 |
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21 |
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22 |
long timeout = -1; /* Server non-response timeout in seconds. */ |
extern options_t opts; |
23 |
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extern connection_t connpri, connaux; |
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int sockpri = -1; /* Main socket used mostly. */ |
|
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int sockaux = -1; /* Auxiliary socked used when another |
|
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connection is needed. */ |
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#ifdef SSL_TLS |
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static SSL *sslpri = NULL; |
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static SSL *sslaux = NULL; |
|
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#endif |
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24 |
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25 |
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26 |
/* |
/* |
27 |
* Connect to mail server. |
* Connect to mail server. |
28 |
*/ |
*/ |
29 |
int init_connection(int *sock, char *serv, unsigned short int port, |
int |
30 |
unsigned int protocol) |
init_connection(connection_t * conn, char *serv, unsigned short int port, |
31 |
|
unsigned int protocol) |
32 |
{ |
{ |
33 |
struct sockaddr_in sa; |
struct sockaddr_in sa; |
34 |
struct hostent *he; |
struct hostent *he; |
35 |
#ifdef SSL_TLS |
|
36 |
SSL **ssl = (sock == &sockpri ? &sslpri : &sslaux); |
#ifndef SSL_TLS |
37 |
#else |
if (protocol != SSL_DISABLED) { |
38 |
if (protocol != SSL_DISABLED) { |
error("SSL not supported by this build\n"); |
39 |
error("imapfilter: SSL not supported by this build\n"); |
return ERROR_SSL; |
40 |
return ERROR_SSL; |
} |
|
} |
|
41 |
#endif |
#endif |
42 |
|
|
43 |
memset((char *)&sa, 0, sizeof(struct sockaddr_in)); |
memset((char *)&sa, 0, sizeof(struct sockaddr_in)); |
44 |
|
|
45 |
*sock = socket(PF_INET, SOCK_STREAM, 0); |
conn->sock = socket(AF_INET, SOCK_STREAM, 0); |
46 |
|
|
47 |
if (*sock < 0) { |
if (conn->sock < 0) { |
48 |
error("imapfilter: create socket; %s\n", strerror(errno)); |
error("create socket; %s\n", strerror(errno)); |
49 |
return ERROR_NETWORK; |
return ERROR_NETWORK; |
50 |
} |
} |
51 |
if (!(he = gethostbyname(serv))) { |
if (!(he = gethostbyname(serv))) { |
52 |
error("imapfilter: get network host entry of %s; %s\n", serv, |
error("get network host entry of %s; %s\n", serv, |
53 |
strerror(errno)); |
strerror(errno)); |
54 |
close_connection(sock); |
close_connection(conn); |
55 |
return ERROR_NETWORK; |
return ERROR_NETWORK; |
56 |
} |
} |
57 |
sa.sin_family = AF_INET; |
sa.sin_family = AF_INET; |
58 |
sa.sin_port = htons(port); |
sa.sin_port = htons(port); |
59 |
sa.sin_addr = *(struct in_addr *) he->h_addr; |
sa.sin_addr = *(struct in_addr *)he->h_addr; |
60 |
|
|
61 |
xstrncpy(serv, he->h_name, SERVER_LEN - 1); |
if (connect(conn->sock, (struct sockaddr *)&sa, |
62 |
|
sizeof(struct sockaddr))) { |
63 |
if (connect(*sock, (struct sockaddr *) & sa, sizeof(struct sockaddr))) { |
error("initiating connection to %s; %s\n", serv, |
64 |
error("imapfilter: initiating connection to %s; %s\n", serv, |
strerror(errno)); |
65 |
strerror(errno)); |
close_connection(conn); |
66 |
close_connection(sock); |
return ERROR_NETWORK; |
67 |
return ERROR_NETWORK; |
} |
68 |
} |
if (conn == &connpri) |
69 |
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info("Connected to %s.\n", he->h_name); |
70 |
|
|
71 |
#ifdef SSL_TLS |
#ifdef SSL_TLS |
72 |
if (protocol != SSL_DISABLED) |
if (protocol != SSL_DISABLED) |
73 |
if (!ssl_init(sock, protocol)) { |
if (!init_secure_connection(conn, protocol)) |
74 |
if (sock == &sockpri) |
return 0; |
75 |
info("Connected to %s using %s.\n", serv, |
else |
76 |
SSL_get_cipher(*ssl)); |
return ERROR_SSL; |
77 |
return 0; |
else |
78 |
} else |
conn->ssl = NULL; |
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return ERROR_SSL; |
|
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else |
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*ssl = NULL; |
|
79 |
#endif |
#endif |
80 |
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|
81 |
if (sock == &sockpri) |
return 0; |
|
info("Connected to %s.\n", serv); |
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return 0; |
|
82 |
} |
} |
83 |
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84 |
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|
86 |
/* |
/* |
87 |
* Initialize Secure Socket Layer connection. |
* Initialize Secure Socket Layer connection. |
88 |
*/ |
*/ |
89 |
int ssl_init(int *sock, unsigned int protocol) |
int |
90 |
|
init_secure_connection(connection_t * conn, unsigned int protocol) |
91 |
{ |
{ |
92 |
int e; |
int e; |
93 |
unsigned int i, n = 0; |
SSL_CTX *ctx; |
94 |
SSL_CTX *ctx; |
SSL_METHOD *method; |
95 |
SSL_METHOD *method = NULL; |
|
96 |
X509 *cert; |
method = NULL; |
97 |
char *c; |
|
98 |
const EVP_MD *evp; |
SSL_library_init(); |
99 |
unsigned char digest[EVP_MAX_MD_SIZE]; |
SSL_load_error_strings(); |
100 |
SSL **ssl = (sock == &sockpri ? &sslpri : &sslaux); |
|
101 |
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switch (protocol) { |
102 |
SSL_library_init(); |
case SSL_TLS_V1: |
103 |
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method = TLSv1_client_method(); |
104 |
switch (protocol) { |
break; |
105 |
case SSL_SSL_V2: |
case SSL_SSL_V2: |
106 |
method = SSLv2_client_method(); |
case SSL_SSL_V3: |
107 |
break; |
method = SSLv23_client_method(); |
108 |
case SSL_SSL_V3: |
break; |
109 |
method = SSLv3_client_method(); |
} |
|
break; |
|
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case SSL_TLS_V1: |
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method = TLSv1_client_method(); |
|
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break; |
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} |
|
110 |
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|
111 |
if (!(ctx = SSL_CTX_new(method))) |
if (!(ctx = SSL_CTX_new(method))) |
112 |
return ERROR_SSL; |
goto fail; |
113 |
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|
114 |
if (!(*ssl = SSL_new(ctx))) |
if (!(conn->ssl = SSL_new(ctx))) |
115 |
return ERROR_SSL; |
goto fail; |
116 |
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|
117 |
SSL_set_fd(*ssl, *sock); |
SSL_set_fd(conn->ssl, conn->sock); |
118 |
|
|
119 |
e = SSL_connect(*ssl); |
if ((e = SSL_connect(conn->ssl)) <= 0) { |
120 |
|
SSL_get_error(conn->ssl, e); |
121 |
|
error("initiating SSL connection; %s\n", |
122 |
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ERR_error_string(ERR_get_error(), NULL)); |
123 |
|
goto fail; |
124 |
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} |
125 |
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if (opts.verbosity >= 1) { |
126 |
|
SSL_CIPHER *cipher; |
127 |
|
char *ver; |
128 |
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const char *name; |
129 |
|
int usebits, algbits; |
130 |
|
|
131 |
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cipher = SSL_get_current_cipher(conn->ssl); |
132 |
|
ver = SSL_CIPHER_get_version(cipher); |
133 |
|
name = SSL_CIPHER_get_name(cipher); |
134 |
|
usebits = SSL_CIPHER_get_bits(cipher, &algbits); |
135 |
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printf("SSL/TLS handshake completed: %s with cipher %s " |
136 |
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"(%d/%d bits).\n", ver, name, usebits, algbits); |
137 |
|
} |
138 |
|
if (get_cert(conn)) |
139 |
|
goto fail; |
140 |
|
|
141 |
if (e <= 0) { |
SSL_CTX_free(ctx); |
|
SSL_get_error(*ssl, e); |
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error("imapfilter: initiating SSL connection; %s", |
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ERR_error_string(ERR_get_error(), NULL)); |
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return ERROR_SSL; |
|
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} |
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/* Get server's certificate. */ |
|
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if (!(cert = SSL_get_peer_certificate(*ssl))) |
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return ERROR_SSL; |
|
142 |
|
|
143 |
if (!(c = X509_NAME_oneline(X509_get_subject_name(cert), 0, 0))) |
return 0; |
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return ERROR_SSL; |
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verbose("Server certificate subject: %s\n", c); |
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xfree(c); |
|
144 |
|
|
145 |
if (!(c = X509_NAME_oneline(X509_get_issuer_name(cert), 0, 0))) |
fail: |
146 |
return ERROR_SSL; |
conn->ssl = NULL; |
147 |
verbose("Server certificate issuer: %s\n", c); |
SSL_CTX_free(ctx); |
|
xfree(c); |
|
148 |
|
|
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if (!(evp = EVP_md5())) |
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return ERROR_SSL; |
|
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if (!(X509_digest(cert, evp, digest, &n))) |
|
149 |
return ERROR_SSL; |
return ERROR_SSL; |
|
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verbose("Server key fingerprint: "); |
|
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for (i = 0; i < n; i++) |
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verbose(i != n - 1 ? "%02X:" : "%02X\n", digest[i]); |
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X509_free(cert); |
|
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SSL_CTX_free(ctx); |
|
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|
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return 0; |
|
150 |
} |
} |
151 |
|
#endif /* SSL_TLS */ |
|
#endif |
|
152 |
|
|
153 |
|
|
154 |
/* |
/* |
155 |
* Disconnect from mail server. |
* Disconnect from mail server. |
156 |
*/ |
*/ |
157 |
int close_connection(int *sock) |
int |
158 |
|
close_connection(connection_t * conn) |
159 |
{ |
{ |
|
#ifdef SSL_TLS |
|
|
SSL **ssl = (sock == &sockpri ? &sslpri : &sslaux); |
|
160 |
|
|
161 |
if (*ssl) { |
#ifdef SSL_TLS |
162 |
SSL_shutdown(*ssl); |
if (conn->ssl) { |
163 |
SSL_free(*ssl); |
SSL_shutdown(conn->ssl); |
164 |
*ssl = NULL; |
SSL_free(conn->ssl); |
165 |
} |
conn->ssl = NULL; |
166 |
|
} |
167 |
#endif |
#endif |
168 |
|
if (conn->sock >= 0 && close(conn->sock) == -1) { |
169 |
if (*sock >= 0 && close(*sock)) { |
error("closing socket; %s\n", strerror(errno)); |
170 |
error("imapfilter: closing socket; %s\n", strerror(errno)); |
return ERROR_NETWORK; |
171 |
return ERROR_NETWORK; |
} else { |
172 |
} else { |
conn->sock = -1; |
173 |
*sock = -1; |
return 0; |
174 |
return 0; |
} |
|
} |
|
175 |
} |
} |
176 |
|
|
177 |
|
|
178 |
/* |
/* |
179 |
* Read data from socket. |
* Read data from socket. |
180 |
*/ |
*/ |
181 |
int socket_read(int *sock, char *buf) |
int |
182 |
|
socket_read(connection_t * conn, char *buf) |
183 |
{ |
{ |
184 |
int f, e, s; |
int f, e, s; |
185 |
fd_set fds; |
fd_set fds; |
186 |
struct timeval tv; |
struct timeval tv; |
187 |
struct timeval *tvp = NULL; |
struct timeval *tvp; |
188 |
#ifdef SSL_TLS |
|
189 |
SSL **ssl = (sock == &sockpri ? &sslpri : &sslaux); |
e = 0; |
190 |
#endif |
s = 1; |
191 |
|
tvp = NULL; |
192 |
e = 0; |
|
193 |
s = 1; |
memset(buf, 0, RESPONSE_BUF + 1); |
194 |
|
|
195 |
memset(buf, 0, RESPONSE_BUF + 1); |
if (opts.timeout >= 0) { |
196 |
|
tv.tv_sec = opts.timeout; |
197 |
if (timeout >= 0) { |
tv.tv_usec = 0; |
198 |
tv.tv_sec = timeout; |
tvp = &tv; |
199 |
tv.tv_usec = 0; |
} |
200 |
tvp = &tv; |
f = fcntl(conn->sock, F_GETFL, 0); |
201 |
} |
fcntl(conn->sock, F_SETFL, f | O_NONBLOCK); |
|
f = fcntl(*sock, F_GETFL, 0); |
|
|
fcntl(*sock, F_SETFL, f | O_NONBLOCK); |
|
202 |
|
|
203 |
FD_ZERO(&fds); |
FD_ZERO(&fds); |
204 |
FD_SET(*sock, &fds); |
FD_SET(conn->sock, &fds); |
205 |
|
|
206 |
#ifdef SSL_TLS |
#ifdef SSL_TLS |
207 |
if (*ssl) { |
if (conn->ssl) { |
208 |
|
while (SSL_pending(conn->ssl) > 0 || |
209 |
|
((s = select(conn->sock + 1, &fds, NULL, NULL, tvp)) > 0 && |
210 |
|
FD_ISSET(conn->sock, &fds))) { |
211 |
|
e = SSL_read(conn->ssl, buf, RESPONSE_BUF); |
212 |
|
|
213 |
|
if (e > 0) |
214 |
|
break; |
215 |
|
|
216 |
|
switch (SSL_get_error(conn->ssl, e)) { |
217 |
|
case SSL_ERROR_WANT_READ: |
218 |
|
case SSL_ERROR_WANT_WRITE: |
219 |
|
continue; |
220 |
|
case SSL_ERROR_ZERO_RETURN: |
221 |
|
return ERROR_NETWORK; |
222 |
|
case SSL_ERROR_SYSCALL: |
223 |
|
case SSL_ERROR_SSL: |
224 |
|
fatal(ERROR_NETWORK, "reading data; %s\n", |
225 |
|
ERR_error_string(ERR_get_error(), NULL)); |
226 |
|
default: |
227 |
|
fatal(ERROR_NETWORK, |
228 |
|
"undefined ssl error while reading data\n"); |
229 |
|
} |
230 |
|
} |
231 |
|
} else |
232 |
|
#endif |
233 |
|
{ |
234 |
|
if ((s = select(conn->sock + 1, &fds, NULL, NULL, tvp)) > 0 && |
235 |
|
FD_ISSET(conn->sock, &fds)) |
236 |
|
e = read(conn->sock, buf, RESPONSE_BUF); |
237 |
|
|
238 |
|
if (e == -1) |
239 |
|
fatal(ERROR_NETWORK, "reading data; %s", |
240 |
|
strerror(errno)); |
241 |
|
else if (e == 0) |
242 |
|
return ERROR_NETWORK; |
243 |
|
} |
244 |
|
|
245 |
for (;;) { |
fcntl(conn->sock, F_SETFL, f); |
|
if (SSL_pending(*ssl) || |
|
|
((s = select(*sock + 1, &fds, NULL, NULL, tvp)) > 0 && |
|
|
FD_ISSET(*sock, &fds))) |
|
|
e = SSL_read(*ssl, buf, RESPONSE_BUF); |
|
246 |
|
|
247 |
if (e > 0) |
if (s == -1) |
248 |
break; |
fatal(ERROR_NETWORK, "waiting to read from socket; %s\n", |
249 |
|
strerror(errno)); |
250 |
switch (SSL_get_error(*ssl, e)) { |
else if (s == 0) |
|
case SSL_ERROR_WANT_READ: |
|
|
case SSL_ERROR_WANT_WRITE: |
|
|
continue; |
|
|
case SSL_ERROR_ZERO_RETURN: |
|
|
return ERROR_NETWORK; |
|
|
case SSL_ERROR_SYSCALL: |
|
|
case SSL_ERROR_SSL: |
|
|
fatal(ERROR_NETWORK, "imapfilter: reading data; %s", |
|
|
ERR_error_string(ERR_get_error(), NULL)); |
|
|
default: |
|
251 |
fatal(ERROR_NETWORK, |
fatal(ERROR_NETWORK, |
252 |
"imapfilter: undefined ssl error while reading data\n"); |
"timeout period expired while waiting to read " |
253 |
} |
"data\n"); |
|
} |
|
|
} else |
|
|
#endif |
|
|
{ |
|
|
if ((s = select(*sock + 1, &fds, NULL, NULL, tvp)) > 0 && |
|
|
FD_ISSET(*sock, &fds)) |
|
|
e = read(*sock, buf, RESPONSE_BUF); |
|
|
|
|
|
if (e == -1) |
|
|
fatal(ERROR_NETWORK, "imapfilter: reading data; %s", |
|
|
strerror(errno)); |
|
|
else if (e == 0) |
|
|
return ERROR_NETWORK; |
|
|
} |
|
|
|
|
|
fcntl(*sock, F_SETFL, f); |
|
|
|
|
|
if (s == -1) |
|
|
fatal(ERROR_NETWORK, "imapfilter: waiting to read from socket; %s\n", |
|
|
strerror(errno)); |
|
|
else if (!s) |
|
|
fatal(ERROR_NETWORK, |
|
|
"imapfilter: timeout period expired while waiting to read " |
|
|
"data\n"); |
|
254 |
|
|
255 |
return 0; |
return 0; |
256 |
} |
} |
257 |
|
|
258 |
|
|
259 |
/* |
/* |
260 |
* Write data to socket. |
* Write data to socket. |
261 |
*/ |
*/ |
262 |
int socket_write(int *sock, char *data) |
int |
263 |
|
socket_write(connection_t * conn, char *data) |
264 |
{ |
{ |
265 |
int f, e, s; |
int f, e, s; |
266 |
fd_set fds; |
fd_set fds; |
267 |
struct timeval tv; |
struct timeval tv; |
268 |
struct timeval *tvp = NULL; |
struct timeval *tvp = NULL; |
269 |
#ifdef SSL_TLS |
|
270 |
SSL **ssl = (sock == &sockpri ? &sslpri : &sslaux); |
e = 0; |
271 |
#endif |
s = 1; |
272 |
|
|
273 |
e = 0; |
if (opts.timeout >= 0) { |
274 |
s = 1; |
tv.tv_sec = opts.timeout; |
275 |
|
tv.tv_usec = 0; |
276 |
if (timeout >= 0) { |
tvp = &tv; |
277 |
tv.tv_sec = timeout; |
} |
278 |
tv.tv_usec = 0; |
f = fcntl(conn->sock, F_GETFL, 0); |
279 |
tvp = &tv; |
fcntl(conn->sock, F_SETFL, f | O_NONBLOCK); |
|
} |
|
|
f = fcntl(*sock, F_GETFL, 0); |
|
|
fcntl(*sock, F_SETFL, f | O_NONBLOCK); |
|
280 |
|
|
281 |
FD_ZERO(&fds); |
FD_ZERO(&fds); |
282 |
FD_SET(*sock, &fds); |
FD_SET(conn->sock, &fds); |
283 |
|
|
284 |
#ifdef SSL_TLS |
#ifdef SSL_TLS |
285 |
if (*ssl) { |
if (conn->ssl) { |
286 |
for (;;) { |
while ((s = select(conn->sock + 1, NULL, &fds, NULL, tvp) > 0 && |
287 |
if ((s = select(*sock + 1, NULL, &fds, NULL, tvp) > 0 && |
FD_ISSET(conn->sock, &fds))) { |
288 |
FD_ISSET(*sock, &fds))) |
e = SSL_write(conn->ssl, data, strlen(data)); |
289 |
e = SSL_write(*ssl, data, strlen(data)); |
|
290 |
|
if (e > 0) |
291 |
|
break; |
292 |
|
|
293 |
|
switch (SSL_get_error(conn->ssl, e)) { |
294 |
|
case SSL_ERROR_WANT_READ: |
295 |
|
case SSL_ERROR_WANT_WRITE: |
296 |
|
continue; |
297 |
|
case SSL_ERROR_ZERO_RETURN: |
298 |
|
return ERROR_NETWORK; |
299 |
|
case SSL_ERROR_SYSCALL: |
300 |
|
case SSL_ERROR_SSL: |
301 |
|
fatal(ERROR_NETWORK, "writing data; %s\n", |
302 |
|
ERR_error_string(ERR_get_error(), NULL)); |
303 |
|
default: |
304 |
|
fatal(ERROR_NETWORK, |
305 |
|
"undefined ssl error while writing data\n"); |
306 |
|
} |
307 |
|
} |
308 |
|
} else |
309 |
|
#endif |
310 |
|
{ |
311 |
|
if ((s = select(conn->sock + 1, NULL, &fds, NULL, tvp)) > 0 && |
312 |
|
FD_ISSET(conn->sock, &fds)) |
313 |
|
e = write(conn->sock, data, strlen(data)); |
314 |
|
|
315 |
|
if (e == -1) |
316 |
|
fatal(ERROR_NETWORK, "writing data; %s", |
317 |
|
strerror(errno)); |
318 |
|
} |
319 |
|
|
320 |
if (e > 0) |
fcntl(conn->sock, F_SETFL, f); |
|
break; |
|
321 |
|
|
322 |
switch (SSL_get_error(*ssl, e)) { |
if (s == -1) |
323 |
case SSL_ERROR_WANT_READ: |
fatal(ERROR_NETWORK, "waiting to write to socket; %s\n", |
324 |
case SSL_ERROR_WANT_WRITE: |
strerror(errno)); |
325 |
continue; |
else if (s == 0) |
|
case SSL_ERROR_ZERO_RETURN: |
|
|
return ERROR_NETWORK; |
|
|
case SSL_ERROR_SYSCALL: |
|
|
case SSL_ERROR_SSL: |
|
|
fatal(ERROR_NETWORK, "imapfilter: writing data; %s", |
|
|
ERR_error_string(ERR_get_error(), NULL)); |
|
|
default: |
|
326 |
fatal(ERROR_NETWORK, |
fatal(ERROR_NETWORK, |
327 |
"imapfilter: undefined ssl error while writing data\n"); |
"timeout period expired while waiting to write " |
328 |
} |
"data\n"); |
|
} |
|
|
} else |
|
|
#endif |
|
|
{ |
|
|
if ((s = select(*sock + 1, NULL, &fds, NULL, tvp)) > 0 && |
|
|
FD_ISSET(*sock, &fds)) |
|
|
e = write(*sock, data, strlen(data)); |
|
|
|
|
|
if (e == -1) |
|
|
fatal(ERROR_NETWORK, "imapfilter: writing data; %s", |
|
|
strerror(errno)); |
|
|
} |
|
|
|
|
|
fcntl(*sock, F_SETFL, f); |
|
|
|
|
|
if (s == -1) |
|
|
fatal(ERROR_NETWORK, "imapfilter: waiting to write to socket; %s\n", |
|
|
strerror(errno)); |
|
|
else if (!s) |
|
|
fatal(ERROR_NETWORK, |
|
|
"imapfilter: timeout period expired while waiting to write " |
|
|
"data\n"); |
|
329 |
|
|
330 |
return 0; |
return 0; |
331 |
} |
} |